Wrap the textview and your spinner inside LinearLayout vertical so that it'll appear as you want. Something like this,
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="44dp"
android:text="Type of Mill" />
<Spinner
android:id="@+id/spinner1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>